So here's my Spoiler's serial number...
Hope to hear from you!

Hi Martijn,
 
Here's the details from the instrument file:
 
SMB4 Spoiler bass
top: Flame Koa
accent: none
body: Mahgoany
neck: 3-piece Maple
scale: 32 medium
fingerboard: Ebony
inlays: Pearloid (plastic) ovals
peghead shape: Cone
body shape: Spoiler
tuners: Chrome Schallers
pickups: AXY
controls: volume, filter, Q-switch, 4-position rotary pickup selector switch, mono output
finish: Polyester clear gloss
originally made for: Wils Musik
birthday: August 31, 1990
 
There's no previously registered owners, and it's almost your bass' twentieth birthday!